Fault detection method and apparatus of brushless direct current motor

Abstract

The invention discloses a fault detection method and apparatus of a brushless direct current motor. The fault detection method includes the following steps of controlling the upper bridge arm switch of any one phase of the three-phase stator winding to be on and controlling an inverter to drive the lower bridge arm switches of the other two phases of the three-phase stator winding to on when the fault testing instruction is received; acquiring the bus voltage value of the brushless direct current motor and the steady-state current value of any one of the other two phases of the three-phase stator winding; calculating the phase resistance of the three-phase stator winding of the brushless direct current motor according to the bus voltage value and the steady-state current value; acquiring the phase inductance according to the phase resistance and steady-state current drop time; and determining the stator of the brushless direct current motor to be not matched and outputting the corresponding alarm signals when the phase resistance and the phase inductance of the three-phase stator winding. The fault that the stator winding of the brushless direct current motor does not match with the brushless direct current motor can be detected during the general assembly test.

Description

technical field [0001] The invention relates to the technical field of motors, and in particular, to a fault detection method and device for a brushless DC motor. Background technique [0002] The stator in the brushless DC motor is used to generate an induced electromotive force after being energized, thereby generating an excitation magnetic field, and exerting a force on the energized conductor in it. In the production process of the brushless DC motor, when the stator is installed in the motor, the stator winding installed in the motor may not match it due to misoperation and other reasons. When the stator winding installed in the motor does not match it, it will affect the working efficiency of the motor. [0003] At present, after the general assembly process of the brushless DC motor, the final assembly test of the brushless DC motor that has completed the final assembly process is generally carried out. However, generally only fault detection such as overcurrent, ov...

AI Technical Summary

Problems solved by technology

In the production process of brushless DC motors, when the stator is installed into the motor, the stator windings installed in the motor may not match it due to misoperation and other reasons.

When the stator winding installed in the motor does not match it, it will affect the working efficiency of the motor

[0003] At present, after the general assembly process of the brushless DC motor, the final assembly test of the brushless DC motor that has completed the final assembly process is generally carried out. Whether the brushless DC motor uses the wrong stator, resulting in lower working efficiency of the motor used

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